perf: 优化 queryset count

apps/jumpserver/rewriting/pagination.py

@@ -1,6 +1,13 @@
 from django.conf import settings
+from django.core.exceptions import FieldError
 from rest_framework.pagination import LimitOffsetPagination
 
 
 class MaxLimitOffsetPagination(LimitOffsetPagination):
     max_limit = settings.MAX_LIMIT_PER_PAGE
+
+    def get_count(self, queryset):
+        try:
+            return queryset.values_list('id').order_by().count()
+        except (AttributeError, TypeError, FieldError):
+            return len(queryset)